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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
 
2015
 
2014
 
2015
 
2014
Service cost - benefits earned during the period
 
$
1.9

 
$
2.0

 
$
5.8

 
$
5.9

Interest cost on projected benefit obligation
 
8.2

 
8.6

 
24.5

 
25.6

Expected return on plan assets
 
(12.7
)
 
(12.0
)
 
(38.1
)
 
(36.0
)
Settlement loss
 
—

 
0.9

 
—

 
1.3

Curtailment loss
 
—

 
—

 
—

 
0.9

Amortization:
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
0.1

 
0.1

 
0.1

 
0.2

Prior service cost
 
0.2

 
0.3

 
0.7

 
1.0

Actuarial net loss
 
5.0

 
3.0

 
15.1

 
8.8

Net periodic benefit cost
 
$
2.7

 
$
2.9

 
$
8.1

 
$
7.7